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          如何监管多线程
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              <time title="Created: 2018-11-14 13:45:21" itemprop="dateCreated datePublished" datetime="2018-11-14T13:45:21+08:00">2018-11-14</time>
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        <p>都知道大型的软件项目中存在大量的线程，例如典型的是我正在做的一个data项目。简单的来讲data就是负责通过API拉取Amazon以及各平台报告的一个系统。为了能够提升速度，data项目部署了一个web服务，5个Job服务，使用了XXL-job对Job进行调度管理。同时每一次Job接收到XXL-job的调度都会开启多个线程同时进行数据报告的拉取。</p>
<p>希望有一个方式能够低影响的管理这些任务，类似一个控制平台的概念。Rocketmq的控制台。</p>
<a id="more"></a>

<p>======================== TODO ========================</p>
<p>解决方案：</p>
<ol>
<li>JMX</li>
<li>类似Hystrix，通过命令模式来监控各个线程池，提供dishboard</li>
</ol>
<p>======================== 目前解决方案 ========================</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 产品提出需要2个小时跑一次 防止崩掉，队列设置60，大于则抛出. 使用者可以使用try，catch进行重试</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> DEFAULT_QUEUE_SIZE = <span class="number">60</span>;</span><br><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> Integer corePoolSize = Runtime.getRuntime().availableProcessors() + <span class="number">1</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 拒绝策略：抛出错误</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> ThreadPoolExecutor advertisingJobExecutor = <span class="keyword">new</span> ThreadPoolExecutor(corePoolSize, corePoolSize, <span class="number">0L</span>, TimeUnit.MILLISECONDS,</span><br><span class="line">    <span class="keyword">new</span> LinkedBlockingQueue&lt;&gt;(DEFAULT_QUEUE_SIZE), <span class="keyword">new</span> BasicThreadFactory.Builder().namingPattern(<span class="string">&quot;advertising-job-%d&quot;</span>).build(), <span class="keyword">new</span> AbortPolicy());</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 线程池监控系统</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> guodanhao</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2018/11/22 10:22 AM</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Slf4j</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MonitorExecutor</span> <span class="keyword">implements</span> <span class="title">AutoCloseable</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> ConcurrentHashMap&lt;String, ThreadPoolExecutor&gt; threadPoolMap = <span class="keyword">new</span> ConcurrentHashMap&lt;&gt;();</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">add</span><span class="params">(String poolName, ThreadPoolExecutor executor)</span> </span>&#123;</span><br><span class="line">        threadPoolMap.put(poolName, executor);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">MonitorExecutor</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        threadPoolMap.put(<span class="string">&quot;advertising&quot;</span>, AdvertisingJob.advertisingJobExecutor);</span><br><span class="line">        ...</span><br><span class="line">        ...</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">final</span> ScheduledExecutorService scheduledExecutorService = Executors</span><br><span class="line">        .newSingleThreadScheduledExecutor(<span class="keyword">new</span> BasicThreadFactory.Builder().namingPattern(<span class="string">&quot;monitor executor&quot;</span>).build());</span><br><span class="line"></span><br><span class="line">    <span class="meta">@PostConstruct</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="comment">// 上报Metrics，暂时只是打印在日志</span></span><br><span class="line">        scheduledExecutorService.scheduleAtFixedRate(() -&gt; &#123;</span><br><span class="line">            <span class="keyword">if</span> (threadPoolMap.size() == <span class="number">0</span>) &#123;</span><br><span class="line">                <span class="keyword">return</span>;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">for</span> (String poolName : threadPoolMap.keySet()) &#123;</span><br><span class="line">                ThreadPoolExecutor executor = threadPoolMap.get(poolName);</span><br><span class="line">                String poolNameFormat = String.format(<span class="string">&quot;%1$-25s&quot;</span>, poolName);</span><br><span class="line">                log.info(</span><br><span class="line">                    <span class="string">&quot;========&gt;&gt;&gt; poolName:  &#123;&#125; poolSize:&#123;&#125;, activeThreads:&#123;&#125;, queuedSize:&#123;&#125;, tasksCount:&#123;&#125;, completedTaskCount:&#123;&#125;, rejectedHandler:&#123;&#125;&quot;</span>,</span><br><span class="line">                    poolNameFormat, executor.getPoolSize(), executor.getActiveCount(), executor.getQueue().size(), executor.getTaskCount(),</span><br><span class="line">                    executor.getCompletedTaskCount(), executor.getRejectedExecutionHandler().getClass().getSimpleName());</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;, <span class="number">0</span>, <span class="number">120</span>, TimeUnit.SECONDS);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">close</span><span class="params">()</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        scheduledExecutorService.shutdown();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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